Bolt-cutting machine.



PATENTED SEPT. 3, 1907.

H. L. FISHER.

BOLT CUTTING MACHINE.

APPLIOATION FILED JAN. 26, 1907.

rm 4 J \c 1 c LJ Ill n. I 1 m: u j m W L .W@@@ I. r it n 6 H h f ZN J m I Y K F'IE E INVENTOR w m m 1 'UNITED STATES PATENT OFFICE.

. HENRY L. FISHER, OIQWAYNESBORO, PENNSYLVANIA.

BOLT-CUTTING MACHINE.

Specificationof Letters Patent Patented fiept. B, 1907.

Application filed January 26,1907. Serial Bio- 364,289.

threads on bolts and rods; and it consists in the novel construction and combination of the parts hereinafter fully'described and claimed.

In the drawings, Figure 1 is a front view of the head ofa bolt cutting machine constructed according to this invention. Fig. 2 is a side view of the same.

Fig. 3 is a. front view or the cam-ring and its bearing ring with a portion of one of the pairs of cams broken away to show the worm and worm-wheel. Fig. 4 is a plan view of a portion of a bolt and a chaser showing the projection e/ A is a tubular supporting shaft, and B is. a head se-.

cured on the said shaft and having a face-plate b at its front part. This face-plate has dovetailed guides C on its face, and D are chaser-slidcs which workupon the said guides against the face of the face-plate. Each slide carries a screw thread-chaser E. Four slides are preferably provided, and-they are all alike, but more orless than four slides may be provided, it desired. Each chaser-slide has a recess or hold 0, and F is a retracting spring arranged in the said recess. One end of this spring bears against a stop f which projects from the face-plate, and the other end of the spring bears against the head f of an adjusting screw.

The adjusting screw engages with the slide at the outer end of the hole 0, and it affords a means for regu-. lating the tension of the spring F.

The chaser E is clamped .to the chaser-slide D by a bar G and screws -g. The bar G is let intoa recess in. the slide, and it has a dovetailed projection or rib 9 upon one side.

Upon the other side the bar G has a rectangular rib h which engages with a corresponding groove in the slide. The slide has a dovetailed portion I, and the chaser has a dovetailed part 1 on its back which engages with the dovetailed socket formed'between the parts I and g. I

I is a spring arranged between the bar G and the slide, so that the bar is moved away from the 'slide so as to release the chaser when the screws gare slackened.

The chaser has grooves formed longitudinally in its front face, and its front end is beveled so to form a suitable serrated cutting-edge. A guide projection e is formed on the front end of the chaser to the rear of its cutting-edge, and the point of the cuiling-wlgc is arranged opposite the ccnter of the bolt 1/ with the front and grooved face of the chaser at a tangent to a little over the center line of the bolt and it enables The projection e forms a leader or nut which follows the cutting portion of the chaser and which operates to preserve the correct pitch as soon as it engages with the threads which have been cut into the bolt by the cutting portion of the chaser. This projection e does not differ in structure or in use from those heretofore used onchascrs of this sort.

A nut J is secured to the slid c, and j is a screw which the chaser so that it can he slid inits socket before being tightly clamped to the slide.

- Kjs a lever having its middle part pivoted on a pin k which is carried by the head-and provided with a clamping-nut K. The bearing-portion 1*. upon which the lever works is eccentric oi the end portions of the turned around before being clamped by its nut and the position of the cutting-edge of thochaser with reference to the bolt b can be adjusted thereby with great exactness.

M is a connecting-rod which is pivoted to the front end of the lever K-by a pin 'm, and to the said slide by a pin in. The rod M is arranged at an acute angle with the lace-plate so as to press the slide against the laceplate when it is moved towards the bolt b. By presschaser is preventedfroni beingtilted in the act of cutting the screwthread. I

The rear end of the lever K is provided with an antifriction roller n. P is a cylindrical guide on the rear part of the head A, and Q is a bearing-ring which is splined on the said guide so that it maybe moved back and forth'longitudinally. This bearing-ring is provided with a flange q at its rear end, and stop-screws q or other equivalent stops, at its front end. R is a cam-ring which is journaled on the bearingring Q between the flange q and the heads of the stopscrews. This cam-ring is provided with a circumferential groove It, for an operating lever of approved construction to engage with. Grooved eccentric cams r r are formed on the front lace of the cam-ring [or engaging with the rollerof the lever K. The cams r r are arranged in pairs, the cams 'r being shorter or smaller in diameter than the cams r and projecting forwardly in advance of them. Four pairs of cams are provided, one pair for each lever K, and these cams form adjustable abutments for the rollers n to engage with. When the rollers n engage with the shorter or smaller cams r the cutting-edges of the chaser-s are held clear of the bolt, but when the cam-ring and beariug-ring are slid longitudinally so as to place the rollers 11- in engage- 1 ment with the larger cams r, the chasers are moved into the chaser to cut a bctter'screwthroad on the bolt.

pin which-engage with the head. The pin is can be ing the slide in this manner against the face-plate, the' the periphery of the bolt. The projection 6 projects engages with the said nut and bears against the heel of v position to cut the screwthreads. These pairs ofcams are not [or the purpose oi feeding up the chascrs against the bolt, but for holding the chase-rs in two extreme positions.

The cam-ring is moved circumierentially to adapt the chaser-slides for bolts of different size, and for this purpose worm-wheel teeth S are formed on the bearing-ring Q. A worm s is journaled in a bearing 8 in the camring, and engages with the said teeth. The worm is revolved by any approved means, and a graduated scale T is formed on the flange of the bearing ring so as to indicate the relative positions of the bearing-ring and camring.

In cutting the screwthreads the bolt b maybe revolved in the head, or the head may be revolved about the bolt by any approved driving mechanism. The cam-ring enables the parts to be adjusted simultaneously, by moving it circumierentially, so as to suit bolts of different diameters. The eccentric pivot pins 1c enable each chaser and its slide to be adjusted individually and independent of the others. When moved longitudinally the canrring slides the chasers radially of the bolt into their cutting and clear positions. The springs F press the rollers n against the abutment cams, and slide the chasers radially away from the bolt when the cam-ring is slid rearwardly to permit the rollers n to engage with the smaller cams r.

What I .claim is:

1. The combination, with a head provided with guides and a face-plate, of chaser-slides engaging with the said guides and bearing against the front face of the said face plate, levers pivoted to the said head and projecting out from the front face of the said face-plate, connecting-rods between the said slides and the front ends of the said levers, and means for operating the said levers.

2. The combination, with a head provided with guides, of chaser-slides engaging with the said guides, levers operatively connected with the said slides, means for operating all the said levers and slides simultaneously, adjustable pivot-pins for the said levers carried by the said head and affording a means for adjusting the position of each said slide independent of the others, and locking-devices for securing the said pivot-pins to the said head after their positions have been adjusted.

3. The combination, with a head provided with guides, 01' chaser-slides engaging with the said guides, adjustable eccentric pivot pins journaled in the said head, levers pivoted on the'said pins and having their front ends operativeiy connected with the said slides, and abutments engaging with the rear ends of the said levers.

4. The combination, with a chaser-slide provided with a recess and a dovetailed portion, of a clamping-bar arranged in the said recess and provided with a dovetailed rib, a chaser having a dovetailed projection engaging withthe socket formed between the said dovetailed projection and rib, and means for securing the said bar in the said recess.

5. The combination, with a head provided with guides, of chaser-slides engaging with the said guides, levers pivoted to the said head and operatively connected with the said slides, and circuml'erentialiy adjustable cams for opstating the said levers simultaneously, the said cams being arranged in pairs, and the cams of each said pair being of different height and arranged parallel with each other and eccentric 011 the said head.

6. The combination, with a head provided with guides, of chaser-slides engaging with the said guides, levers pivotedto the said head and having their front ends operatively connected with the said slides, a bearing-ring slid able longitudinally of the said head, a cam-ring carried by the said bearinga-ing and provided with cams of different height arranged in pairs the cams of each pair being parallei with each other and eccentric of the said head and engaging with the rear ends of the said levers, and means for adjusting the said cam ring circumferentially upon the said bearing-ring, whereby the cams of each pair are adjusted simultaneously,

7. The combination, with a chaser-slide provided with a recess and a dovetailed portion, of a clamping-bar arranged in the said recess and also provided with a dovetailed portion, a chaser having a dovetailed projection which is adjustable longitudinally in the socket formed between the two said dovetailed portions, and screws which secure the said bar to the said slide and thereby clamp the said chaser to the said slide.

In testimony whereof Ihave aflixed my signature in the presence of two witnesses.

- HENRY L. FISHER.

Witnesses:

CHAS. F. Koorm, A. STOVER FIN. 

